Illustrator CEPHtmlEngine / OnBoarding prevents display sleep on Windows
Illustrator 2026 30.3.0 on Windows prevents the display from sleeping while Illustrator is running.
This does not appear as a normal DISPLAY power request:
powercfg /requests shows DISPLAY: None, except when unrelated Tobii presence detection is running.
I tested the following:
- Disabled "Show The Home Screen When No Documents Are Open"
- Disabled "GPU Performance"
- Restarted Illustrator
- Confirmed Illustrator still launches CEPHtmlEngine for com.adobe.illustrator.OnBoarding
- Left Illustrator.exe running, but terminated only the Illustrator-owned CEPHtmlEngine processes
- After doing that, the display slept normally after 5 minutes
The active process command line included:
com.adobe.illustrator.OnBoarding
CEPHtmlEngine12-ILST-30.3.0-com.adobe.illustrator.OnBoarding.log
This suggests com.adobe.illustrator.OnBoarding / CEPHtmlEngine is preventing Windows display sleep without registering as a DISPLAY request in powercfg.
杉本大地
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